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doc:user:general:ifields

Fields at Gauss Points

Fields that are computed at each integration point are referenced by codes with the IF prefix (standing for Internal Field).

Metafor Code Description
IF_DEV_SIG_XX Cauchy stress deviator tensor (see important remark at the bottom)
IF_DEV_SIG_YY
IF_DEV_SIG_ZZ
IF_SIG_XX Cauchy stress tensor (see important remark at the bottom)
IF_SIG_YY
IF_SIG_ZZ
IF_SIG_XY
IF_SIG_XZ
IF_SIG_YZ
IF_DEV_SIG_ORTHO_XX Cauchy stress deviator tensor in a frame which moves with the matter (see important remark at the bottom)
IF_DEV_SIG_ORTHO_YY
IF_DEV_SIG_ORTHO_ZZ
IF_SIG_ORTHO_XX Cauchy stress deviator tensor in a frame which moves with the matter
IF_SIG_ORTHO_YY
IF_SIG_ORTHO_ZZ
IF_SIG_ORTHO_XY
IF_SIG_ORTHO_XZ
IF_SIG_ORTHO_YZ
IF_ALP_XX “backstress” (kinematic hardening)
IF_ALP_YY
IF_ALP_ZZ
IF_ALP_XY
IF_ALP_XZ
IF_ALP_YZ
IF_GL_STRAIN_XX Green-Lagrange strains (in the initial frame)
IF_GL_STRAIN_YY
IF_GL_STRAIN_ZZ
IF_GL_STRAIN_XY
IF_GL_STRAIN_XZ
IF_GL_STRAIN_YZ
IF_NAT_STRAIN_XX Natural strains (in the initial frame)
IF_NAT_STRAIN_YY
IF_NAT_STRAIN_ZZ
IF_NAT_STRAIN_XY
IF_NAT_STRAIN_XZ
IF_NAT_STRAIN_YZ
IF_BIOT_STRAIN_XX Biot strains (in the initial frame)
IF_BIOT_STRAIN_YY
IF_BIOT_STRAIN_ZZ
IF_BIOT_STRAIN_XY
IF_BIOT_STRAIN_XZ
IF_BIOT_STRAIN_YZ
IF_ALP_J2 contrainte cinématique équivalente :?:
IF_P pressure
IF_EPL equivalent plastic strain
IF_DEPL equivalent plastic strain rate
IF_EVMS von Mises stress
IF_CRITERION Plastic Criterion (different to EVMS if VonMises is not used as plastic Critetion)
IF_YIELD_STRESS yield stress
IF_VISCOPLAST_STRESS Visco-Plastic Stress
IF_GRAINSIZE grain size Value
IF_GRAINSIZE_STRESS grain size Stress
IF_TRIAX stress triaxiality T = hydrostatic stress / equivalent stress
IF_RUPT_CRIT rupture Criterion
IF_ISO_DAMAGE isotropic damage
IF_DAMAGE_XX orthotropic damage
IF_DAMAGE_YY
IF_DAMAGE_ZZ
IF_DAMAGE_XY
IF_DAMAGE_YZ
IF_DAMAGE_XZ
IF_RHO density
IF_FLUX_X heat flux
IF_FLUX_Y
IF_FLUX_Z
IF_GRADT_X temperature gradient
IF_GRADT_Y
IF_GRADT_Z
IF_DEV_SIG_XX_UPPER_SIDE stress deviator tensor - upper skin of a shellExpert!Danger!
IF_DEV_SIG_YY_UPPER_SIDE
IF_DEV_SIG_ZZ_UPPER_SIDE
IF_SIG_XX_UPPER_SIDE stress tensor - upper skin of a shellExpert!Danger!
IF_SIG_YY_UPPER_SIDE
IF_SIG_ZZ_UPPER_SIDE
IF_SIG_XY_UPPER_SIDE
IF_SIG_XZ_UPPER_SIDE
IF_SIG_YZ_UPPER_SIDE
IF_P_UPPER_SIDE pressure - upper skin of a shellExpert!Danger!
IF_EPL_UPPER_SIDE equivalent plastic strain - upper skin of a shellExpert!Danger!
IF_DEV_SIG_XX_LOWER_SIDE stress deviator tensor - lower skin of a shellExpert!Danger!
IF_DEV_SIG_YY_LOWER_SIDE
IF_DEV_SIG_ZZ_LOWER_SIDE
IF_SIG_XX_LOWER_SIDE stress tensor - lower skin of a shellExpert!Danger!
IF_SIG_YY_LOWER_SIDE
IF_SIG_ZZ_LOWER_SIDE
IF_SIG_XY_LOWER_SIDE
IF_SIG_XZ_LOWER_SIDE
IF_SIG_YZ_LOWER_SIDE
IF_P_LOWER_SIDE pressure - lower skin of a shellExpert!Danger!
IF_EPL_LOWER_SIDE equivalent plastic strain - lower skin of a shellExpert!Danger!
IF_THICKNESS deformed thickness of a shellExpert!Danger!
IF_CURVATURE_XX shell curvaturesExpert!Danger!
IF_CURVATURE_YY
IF_CURVATURE_ZZ
IF_CURVATURE_XY
IF_CURVATURE_XZ
IF_CURVATURE_YZ
IF_TORQUE_XX shell torquesExpert!Danger!
IF_TORQUE_YY
IF_TORQUE_ZZ
IF_TORQUE_XY
IF_TORQUE_XZ
IF_TORQUE_YZ
IF_FTOTAL_XX deformation gradient
IF_FTOTAL_YY
IF_FTOTAL_ZZ
IF_FTOTAL_XY
IF_FTOTAL_XZ
IF_FTOTAL_YZ
IF_FTOTAL_YX
IF_FTOTAL_ZX
IF_FTOTAL_ZY
IF_LODE_PARAMETER Lode parameter $\in [-1,1]$

This codes are to be used in Saving history curves to disk to specify which field must be archived.

Important note: IF_SIG_XX stresses are always Cauchy stresses, whether a hypoelastic or hyperelastic formulation is used. To get Piola-Kirchhoff-2 stresses, the transformation formula must be applied, used the gradient deformation tensor (IF_FTOTAL_XX, …):

$$ \boldsymbol{\sigma}_{\text{cauchy}} = \dfrac{\mathbf{F}\,\boldsymbol{\sigma}_{\text{PK2}}\,\mathbf{F}^T}{\det(\mathbf{F}_{\text{total}})} $$

doc/user/general/ifields.txt · Last modified: 2018/08/30 12:56 by papeleux